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    <li><a href="#最佳答案"><strong>最佳答案</strong></a></li>
    <li><a href="#这应该工作">这应该工作：</a></li>
    <li><a href="#如何转换bytedata为listint">如何转换<code>ByteData</code>为<code>List&lt;int&gt;</code>？</a></li>
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    <article class="post">
        <header>
            <h1 class="post-title">Flutter视频播放器问题</h1>
        </header>
        <date class="post-meta meta-date">
            2021年8月30日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
        </div>
        
        
        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
        </div>
        
        
        <div class="post-content">
            <blockquote>
<p>本文主要介绍</p>
</blockquote>
<p>大约一个月前，我写了一个关于视频播放器包的小类，我在应用程序中使用它来显示来自 vimeo 的视频。今天我将这个类添加到一个新项目中，在初始化播放器时我得到了这个:
E/flutter (20716): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] 未处理的异常:PlatformException( channel 错误，无法在 channel 上建立连接。，空，空)
E/flutter (20716): #0 VideoPlayerApi.initialize (package:video_player_platform_interface/messages.dart:177:7)
E/flutter (20716):
E/flutter (20716):#1 MethodChannelVideoPlayer.init &hellip;
奇怪的是，它在我的另一个项目中使用相同的代码/脚手架仍然可以完美地工作，所以我现在不知所措，不知道发生了什么&hellip;&hellip;</p>
<p><strong>最佳答案</strong></p>
<p>在您的 MainActivity 中添加此代码</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/img/image-20210830214436181.png">
            <img class="mx-auto" alt="image-20210830214436181" src="https://luckly007.oss-cn-beijing.aliyuncs.com/img/image-20210830214436181.png" />
        </a>
    </p>
<pre><code>import android.content.Context
import android.os.Bundle
import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin
import io.flutter.plugins.videoplayer.*





class MainActivity : FlutterActivity() {

override fun configureFlutterEngine(@NonNull flutterEngine: 
 FlutterEngine) {
    super.configureFlutterEngine(flutterEngine)
    flutterEngine.getPlugins().add(SharedPreferencesPlugin())
    flutterEngine.getPlugins().add(VideoPlayerPlugin())

}
}
</code></pre><p>如何将数字转换为科学记数法并获得指数？例如，如果我有 0.000000001 并想将其转换为 1e-9</p>
<p><strong>最佳答案</strong></p>
<p>使用 <a href="https://pub.dev/packages/intl">intl package</a>并尝试如下</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">final</span> value <span style="color:#f92672">=</span> <span style="color:#ae81ff">0.000000025</span>;
<span style="color:#66d9ef">String</span> res <span style="color:#f92672">=</span> NumberFormat.scientificPattern(Localizations.localeOf(context).languageCode).format(value);
print(<span style="color:#e6db74">&#34;Formatted value is </span><span style="color:#e6db74">$</span>res<span style="color:#e6db74">&#34;</span>);
</code></pre></div><p><strong>编辑</strong>
一种更好、更干净的方法，不需要任何额外的包，是方法 <code>toStringAsExponential()</code> .这是如何使用它</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">final</span> value <span style="color:#f92672">=</span> <span style="color:#ae81ff">0.000000025</span>;
print(value.toStringAsExponential());
</code></pre></div><h1 id="encoding---如何将-dart-的bytedata转换为字符串">encoding - 如何将 Dart 的ByteData转换为字符串？</h1>
<p>我正在读取一个二进制文件，并希望将其转换为字符串。如何在Dart中完成？</p>
<h2 id="最佳答案"><strong>最佳答案</strong></h2>
<p>尝试以下</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">String</span> getStringFromBytes(ByteData data) {
  <span style="color:#66d9ef">final</span> buffer <span style="color:#f92672">=</span> data.buffer;
  <span style="color:#66d9ef">var</span> list <span style="color:#f92672">=</span> buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
  <span style="color:#66d9ef">return</span> utf8.decode(list);
}
</code></pre></div><p><a href="https://docs.flutter.io/flutter/dart-typed_data/ByteData-class.html"><code>ByteData</code></a> 是一个抽象：</p>
<blockquote>
<p>一个固定长度的随机访问字节序列，它还提供对这些字节表示的固定宽度整数和浮点数的随机和未对齐访问。</p>
</blockquote>
<p>正如 Gunter 在评论中提到的，您可以使用<a href="https://api.dartlang.org/dev/2.0.0-dev.52.0/dart-io/File/writeAsBytes.html"><code>File.writeAsBytes</code></a>. 但是，它确实需要一些 API 工作才能从<code>ByteData</code>到<code>List&lt;int&gt;</code>。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:async&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:io&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:typed_data&#39;</span>;

Future<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">void</span><span style="color:#f92672">&gt;</span> writeToFile(ByteData data, <span style="color:#66d9ef">String</span> path) {
  <span style="color:#66d9ef">final</span> buffer <span style="color:#f92672">=</span> data.buffer;
  <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> File(path).writeAsBytes(
      buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
</code></pre></div><p>你需要安装<a href="https://pub.dev/packages/path_provider">path_provider</a>包，然后</p>
<h2 id="这应该工作">这应该工作：</h2>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:async&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:io&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:typed_data&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:path_provider/path_provider.dart&#39;</span>;

<span style="color:#66d9ef">final</span> dbBytes <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> rootBundle.load(<span style="color:#e6db74">&#39;assets/file&#39;</span>); <span style="color:#75715e">// &lt;= your ByteData
</span><span style="color:#75715e"></span>
<span style="color:#75715e">//=======================
</span><span style="color:#75715e"></span>Future<span style="color:#f92672">&lt;</span>File<span style="color:#f92672">&gt;</span> writeToFile(ByteData data) <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">final</span> buffer <span style="color:#f92672">=</span> data.buffer;
    Directory tempDir <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> getTemporaryDirectory();
    <span style="color:#66d9ef">String</span> tempPath <span style="color:#f92672">=</span> tempDir.path;
    <span style="color:#66d9ef">var</span> filePath <span style="color:#f92672">=</span> tempPath <span style="color:#f92672">+</span> <span style="color:#e6db74">&#39;/file_01.tmp&#39;</span>; <span style="color:#75715e">// file_01.tmp is dump file, can be anything
</span><span style="color:#75715e"></span>    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> File(filePath).writeAsBytes(
        buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
}
<span style="color:#75715e">//======================
</span></code></pre></div><p>获取您的文件：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">var</span> file;
<span style="color:#66d9ef">try</span> {
    file <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> writeToFile(dbBytes); <span style="color:#75715e">// &lt;= returns File
</span><span style="color:#75715e"></span>} <span style="color:#66d9ef">catch</span>(e) {
    <span style="color:#75715e">// catch errors here
</span><span style="color:#75715e"></span>}
</code></pre></div><h2 id="如何转换bytedata为listint">如何转换<code>ByteData</code>为<code>List&lt;int&gt;</code>？</h2>
<p>经过自我调查，解决方案是：</p>
<ol>
<li>用 <code>.cast&lt;int&gt;()</code></li>
</ol>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">ByteData audioByteData <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> rootBundle.load(audioAssetsFullPath);
Uint8List audioUint8List <span style="color:#f92672">=</span> audioByteData.buffer.asUint8List(audioByteData.offsetInBytes, audioByteData.lengthInBytes);
List<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">int</span><span style="color:#f92672">&gt;</span> audioListInt <span style="color:#f92672">=</span> audioUint8List.cast<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">int</span><span style="color:#f92672">&gt;</span>();
</code></pre></div><p>或 2. 使用 <code>.map</code></p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">ByteData audioByteData <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> rootBundle.load(audioAssetsFullPath);
Uint8List audioUint8List <span style="color:#f92672">=</span> audioByteData.buffer.asUint8List(audioByteData.offsetInBytes, audioByteData.lengthInBytes);
List<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">int</span><span style="color:#f92672">&gt;</span> audioListInt <span style="color:#f92672">=</span> audioUint8List.map((eachUint8) <span style="color:#f92672">=&gt;</span> eachUint8.toInt()).toList();
</code></pre></div><h1 id="flutter---如何在-dartflutter-中收听流值">flutter - 如何在 dart/flutter 中收听流值</h1>
<p>任何人帮助追踪音频的位置(即)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">   <span style="color:#66d9ef">if</span>(durationtoOne(position<span style="color:#f92672">==</span><span style="color:#ae81ff">5</span>)){
FlutterToast.Showtoast(msg:<span style="color:#e6db74">&#34;I am At 5 sec&#34;</span>);
}
</code></pre></div><p>如果在 initstate 中添加出现错误，我会被困在何处添加此代码，
我想通过音频平台收听位置</p>
<p>代码从这里开始</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  <span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:async&#39;</span>;
    <span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:assets_audio_player/assets_audio_player.dart&#39;</span>;
    <span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
    <span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:fluttertoast/fluttertoast.dart&#39;</span>;

    <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">SmartMantra</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
    <span style="color:#960050;background-color:#1e0010">@</span>override
  _SmartMantraState createState() <span style="color:#f92672">=&gt;</span> _SmartMantraState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_SmartMantraState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>SmartMantra<span style="color:#f92672">&gt;</span> {
  StreamSubscription _positionSubscription;
  Duration position;
  AssetsAudioPlayer _assetsAudioPlayer;


  stream() {
    _positionSubscription <span style="color:#f92672">=</span> _assetsAudioPlayer.currentPosition
        .listen((p) <span style="color:#f92672">=&gt;</span> setState(() <span style="color:#f92672">=&gt;</span> position <span style="color:#f92672">=</span> p),);
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> initState() {
    _assetsAudioPlayer.open(<span style="color:#e6db74">&#34;assets/shivamantra.mp3&#34;</span>);
    stream();
    _assetsAudioPlayer.finished.listen((finished) {
      print(finished);
<span style="color:#75715e">//      print(count);
</span><span style="color:#75715e"></span>    });
    <span style="color:#66d9ef">super</span>.initState();
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> dispose() {
    _positionSubscription.cancel();
    <span style="color:#66d9ef">super</span>.dispose();
  }
  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Scaffold(
        body: Column(
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            SizedBox(
              height: <span style="color:#ae81ff">70</span>,
            ),
            Center(
              child: Text(
               durationToone(position).toString(),
                style: TextStyle(color: Colors.black, fontSize: <span style="color:#ae81ff">12</span>),
              ),
            ),
            <span style="color:#75715e">//getTextContainer()
</span><span style="color:#75715e"></span>          ],
        ));
  }
<span style="color:#66d9ef">int</span> durationToone(Duration duration) {
  <span style="color:#66d9ef">int</span> twoDigits(<span style="color:#66d9ef">int</span> n) {
    <span style="color:#66d9ef">if</span> (n <span style="color:#f92672">&gt;=</span> <span style="color:#ae81ff">10</span>) <span style="color:#66d9ef">return</span> n;
    <span style="color:#66d9ef">return</span> n;
  }

  <span style="color:#66d9ef">int</span> twoDigitSeconds <span style="color:#f92672">=</span>
      twoDigits(duration.inSeconds.remainder(Duration.secondsPerMinute));
  <span style="color:#66d9ef">return</span> twoDigitSeconds;
}
}
</code></pre></div><p>代码到此结束</p>
<p>总结:在特定位置需要在位置变化时触发一些函数(即)</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">if</span>(durationtoOne(position<span style="color:#f92672">==</span><span style="color:#ae81ff">5</span>)){
FlutterToast.Showtoast(msg:<span style="color:#e6db74">&#34;I am At 5 sec&#34;</span>);
}
</code></pre></div><p>通过音频播放或应用程序在前台</p>
<p><strong>最佳答案</strong></p>
<p>如果流不是广播流，则您只能收听一次。</p>
<p>请参阅此 <a href="https://medium.com/@ayushpguptaapg/using-streams-in-flutter-62fed41662e4">Medium post</a> 以了解有关 Streams 的更多信息。</p>
<p>收听 <code>stream</code> 时，您需要在 <code>_assetsAudioPlayer.currentPosition</code> 函数中添加您的代码。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;dart:async&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:assets_audio_player/assets_audio_player.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:fluttertoast/fluttertoast.dart&#39;</span>;

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">SmartMantra</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
    <span style="color:#960050;background-color:#1e0010">@</span>override
    _SmartMantraState createState() <span style="color:#f92672">=&gt;</span> _SmartMantraState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_SmartMantraState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>SmartMantra<span style="color:#f92672">&gt;</span> {
    StreamSubscription _positionSubscription;
    Duration position;
    AssetsAudioPlayer _assetsAudioPlayer;

    stream() {
        _positionSubscription <span style="color:#f92672">=</span> _assetsAudioPlayer.currentPosition
            .listen((p) {
                setState(() <span style="color:#f92672">=&gt;</span> position <span style="color:#f92672">=</span> p));
                <span style="color:#75715e">// You should add your code here
</span><span style="color:#75715e"></span>                <span style="color:#66d9ef">if</span>(durationtoOne(position<span style="color:#f92672">==</span><span style="color:#ae81ff">5</span>)){
                    FlutterToast.Showtoast(msg:<span style="color:#e6db74">&#34;I am At 5 sec&#34;</span>);
                }
            }
    }

    <span style="color:#960050;background-color:#1e0010">@</span>override
    <span style="color:#66d9ef">void</span> initState() {
        _assetsAudioPlayer.open(<span style="color:#e6db74">&#34;assets/shivamantra.mp3&#34;</span>);
        stream();
        _assetsAudioPlayer.finished.listen((finished) {
            print(finished);
<span style="color:#75715e">//          print(count);
</span><span style="color:#75715e"></span>        });
        <span style="color:#66d9ef">super</span>.initState();
    }

    <span style="color:#960050;background-color:#1e0010">@</span>override
    <span style="color:#66d9ef">void</span> dispose() {
        _positionSubscription.cancel();
        <span style="color:#66d9ef">super</span>.dispose();
    }

    <span style="color:#960050;background-color:#1e0010">@</span>override
    Widget build(BuildContext context) {
        <span style="color:#66d9ef">return</span> Scaffold(
            body: Column(
                children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
                SizedBox(
                    height: <span style="color:#ae81ff">70</span>,
                ),
                Center(
                    child: Text(
                        durationToone(position).toString(),
                        style: TextStyle(color: Colors.black, fontSize: <span style="color:#ae81ff">12</span>),
                    ),
                ),
                <span style="color:#75715e">//getTextContainer()
</span><span style="color:#75715e"></span>            ],
        ));
    }
    <span style="color:#66d9ef">int</span> durationToone(Duration duration) {
        <span style="color:#66d9ef">int</span> twoDigits(<span style="color:#66d9ef">int</span> n) {
            <span style="color:#66d9ef">if</span> (n <span style="color:#f92672">&gt;=</span> <span style="color:#ae81ff">10</span>) <span style="color:#66d9ef">return</span> n;
            <span style="color:#66d9ef">return</span> n;
        }

        <span style="color:#66d9ef">int</span> twoDigitSeconds <span style="color:#f92672">=</span>
            twoDigits(duration.inSeconds.remainder(Duration.secondsPerMinute));
        <span style="color:#66d9ef">return</span> twoDigitSeconds;
    }
}
</code></pre></div><p>11</p>
        </div>

        
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
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